Vehicle Downpipes



Downpipes – the Essential Part for Unrestricted Airflow in Vehicles

A downpipes are is a part of the exhaust system that connects the headers to the catalytic converter. In most of the vehicles, this downpipe section is incorporated along with the catalytic converters section. Because of little performance oriented need and fuel economy benefit in replacing a catalytic converter, these downpipes are given any importance.

However, for a vehicle that is equipped with turbocharger, the after-market downpipe can offer some great improvement in terms of its performance. This is because a turbocharger is a pump, and needs it has to be noted that the pipes getting in and out of this turbocharger needs to have an unrestricted airflow. For this purpose, in many of the turbocharged vehicles, there are numerous bends near the exhaust pipes that are coming in and out of the turbocharger. In that sense, these existing and entering pipes and bends in the vehicle need to facilitate good flow of air without any restrictions. On using some cheap methods or crush bending process to the pipes, as in case of most of the vehicles, it can result in restricted flow of gas. When these pipes restrict exhaust gas flow from in and/or out of the turbo, it turns out to affect the performance of the vehicle. How does this happen? That is quite simple. By reduced gas restrictions in the exhaust pipes, the turbocharger might get spooled up more quickly than ever. These frequent spool-up times in the vehicle can cause more power supple, affecting the fuel economy on the whole. This is why after-market exhaust manufacturers tend to offer some over-sized exhaust downpipes that contain mandrel bends, which facilitate better gas flow to the turbocharger. Need a loan for a new car?

Construction methods:

Downpipes typically have 4 different types of construction methods:

1. Blank plate: this method is identical to the stock construction method using wastegate portion which is completely covered to the ends.

2. Bellmouth: this method is a completely open type of design facilitating better flow within the unit.

3. Split bellmouth: This method is Similar to the bellmouth method but the only difference is that it has a divider that is inserted for the purpose of separating the wastegate.

4. Divorced or Twin Dump: This method uses a separate exhaust pipe and wastegate piping that will connect with the further downstream for the purpose of airflow.

Each of the methods has their own advantages and uses; and no one method can be regarded as better than the other. The design and process targets on the one essential need – a smooth unrestricted overall exhaust flow.